1. Department of Environmental Toxicology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.
2. Institute of Biology, University of Pécs, Pécs, Hungary.
3. Alternative Energy and Atomic Energy Commission (CEA) Saclay, Institute of Biology and Biotechnology at Saclay, National Center for Scientific Research UMR 8221, Gif-sur-Yvette Cedex, France.